The invention relates to a variable double-slider type plastering machine. The variable double-slider type plastering machine comprises a machine frame, a lifting mechanism, a power device and a plastering device, wherein the lifting mechanism consists of multiple parallelogram link mechanisms, two frame connecting rods of a first parallelogram link mechanism are hinged to the machine frame, corresponding links of the first parallelogram link mechanism maintain a horizontal state and are hinged to one end of each of two corresponding links of a second parallelogram link mechanism, the other end of each of the two corresponding links of the second parallelogram link mechanism is hinged to the plastering device so as to enable the plastering device to maintain parallel to a wall, two frame connecting rods of a third parallelogram link mechanism are hinged to sliders which form moving pairs with the machine frame, the sliders are connected with the power device through a telescopic rod, the power device drives the telescopic rod to push/pull the sliders to horizontally move on the machine frame, and the third link mechanism of the lifting mechanism enables the first link mechanism and the second link mechanism to be opposite in rotation direction and identical in rotation angle so as to realize the vertical lifting of the plastering device; a variable double-slider type mechanism is formed by the lifting mechanism, the machine frame, the plastering device and the sliders.